Light emitting display, display panel, and driving method thereof

A display panel of a light emitting display comprising:

• a plurality of data lines for transmitting a data current that displays video signals;
• a plurality of scan lines for transmitting a select signal;
• a plurality of pixels defined by the data lines and the scan lines;
• and
• a pixel circuit formed at each of the plurality of pixels;
• wherein at least one pixel circuit includes:
• a first transistor having a first main electrode coupled to a first power supplying a first voltage;
• a first switch coupled between a second main electrode of the first transistor and a data line and controlled by a first select signal from the scan line;
• a second switch controlled by a first control signal to diode-connect the first transistor;
• a third switch having a first end coupled to a control electrode of the first transistor, and being controlled by a second control signal;
• a fourth switch having a first end coupled to a second main electrode of the first transistor, and being controlled by a third control signal;
• a light emitting element, coupled between a second end of the fourth switch and a second power supplying a second voltage, for emitting light corresponding to an applied current;
• a first storage unit coupled between the control electrode and the first main electrode of the first transistor when the third switch is turned on;
• and
• a second storage unit coupled between the control electrode and the first main electrode of the first transistor when the third switch is turned off.

A method for driving a light emitting display having a pixel circuit including a switch for transmitting a data current from a data line in response to a select signal from a scan line, a transistor including a first main electrode, a second main electrode and a control electrode for outputting a driving current in response to the data current, and a light emitting element for emitting light corresponding to the driving current from the transistor, the method comprising:

• storing a first voltage corresponding to a threshold voltage of the transistor in a first storage unit formed between the control electrode and the first main electrode of the transistor;
• storing a second voltage corresponding to the data current from the switch in a second storage unit formed between the control electrode and the first main electrode of the transistor;
• coupling the first storage unit and the second storage unit to establish a voltage between the control electrode and the first main electrode of the transistor as a third voltage;
• and
• transmitting the driving current from the transistor to the light emitting display;
• wherein the driving current from the transistor is determined corresponding to the third voltage.

A method for driving a light emitting display having a pixel circuit including a switch for transmitting a data current from a data line in response to a select signal from a scan line, a transistor including first and second main electrodes and a control electrode for outputting a driving current in response to the data current, and a light emitting element for emitting light corresponding to the driving current from the transistor, comprising:

• diode-connecting the transistor in response to a first control signal, and coupling a first storage unit between the control electrode and the first main electrode of the transistor in response to a first level of a second control signal to store a first voltage corresponding to a threshold voltage of the transistor in the first storage unit;
• diode-connecting the transistor by the first control signal, coupling a second storage unit between the control electrode and the first main electrode of the transistor in response to a second level of the second control signal, and storing a second voltage corresponding to the data current in the second storage unit in response to the first select signal;
• coupling the first storage unit and the second storage unit in response to the first level of the second control signal to establish a voltage between the control electrode and the first main electrode of the transistor as a third voltage;
• providing the driving current corresponding to the third voltage to the transistor;
• and
• providing the driving current to the light emitting element in response to a third control signal.

In a method for transmitting a data current showing video signals to a transistor in response to a first select signal to drive a light emitting element, a method for driving a light emitting display comprising:

• establishing a first control signal and a second control signal respectively applied to a first switch and a second switch at an enable level to store a first voltage corresponding to a threshold voltage of the transistor;
• establishing a third control signal applied to a third switch at a disable level to electrically intercept the transistor and the light emitting element;
• establishing the first select signal at a disable level to intercept the data current;
• establishing the first select signal at an enable level to supply the data current;
• respectively establishing the first control signal and the second control signal at enable and disable levels to store a second voltage corresponding to the data current;
• establishing the first select signal at a disable level to intercept the data current;
• respectively establishing the first control signal and the second control signal at disable and enable levels to apply a third voltage to a main electrode and a gate electrode of the transistor;
• and
• establishing the third control signal at an enable level to transmit the current from the transistor to the light emitting element;
• wherein the third voltage is determined by the first voltage and the second voltage.